GATE 2021 ES – Question 3

General Aptitude · Spatial Aptitude: Spatial Reasoning and Visualization · 1 mark · Multiple choice

Find the least number of squares to add to the shown arrangement so P–Q becomes a line of symmetry.

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Correct answer: (C) 6

Explanation

Reflect each shaded square across the vertical P–Q line. None of the six reflected positions is already shaded: the offset upper squares and four lower squares each need a partner. Adding their six mirror partners is sufficient and necessary. **6, C**.

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